19997625 has 16 divisors (see below), whose sum is σ = 33276672. Its totient is φ = 10665200.

The previous prime is 19997609. The next prime is 19997641. The reversal of 19997625 is 52679991.

It is an interprime number because it is at equal distance from previous prime (19997609) and next prime (19997641).

It is not a de Polignac number, because 19997625 - 2⁴ = 19997609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26289 + ... + 27038.

It is an arithmetic number, because the mean of its divisors is an integer number (2079792).

Almost surely, 2^19997625 is an apocalyptic number.

19997625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19997625 is a deficient number, since it is larger than the sum of its proper divisors (13279047).

19997625 is an equidigital number, since it uses as much as digits as its factorization.

19997625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53345 (or 53335 counting only the distinct ones).

The product of its digits is 306180, while the sum is 48.

The square root of 19997625 is about 4471.8704140438. The cubic root of 19997625 is about 271.4310166644.

The spelling of 19997625 in words is "nineteen million, nine hundred ninety-seven thousand, six hundred twenty-five".